646429740 has 48 divisors (see below), whose sum is σ = 1974551040. Its totient is φ = 156710080.

The previous prime is 646429733. The next prime is 646429757. The reversal of 646429740 is 47924646.

646429740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 646429692 and 646429701.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 489060 + ... + 490379.

It is an arithmetic number, because the mean of its divisors is an integer number (41136480).

Almost surely, 2^646429740 is an apocalyptic number.

646429740 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

646429740 is an abundant number, since it is smaller than the sum of its proper divisors (1328121300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646429740 is a wasteful number, since it uses less digits than its factorization.

646429740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979462 (or 979460 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 42.

The square root of 646429740 is about 25424.9825958642. The cubic root of 646429740 is about 864.6501932379.

The spelling of 646429740 in words is "six hundred forty-six million, four hundred twenty-nine thousand, seven hundred forty".